Fitment is the same between DE4 and DE5. The only difference is there are extra wires and mirror adjustment pins on the DE4 on the passenger side for the reverse mirror dip. If the connector is different (which off the top of my head I don't believe it is) it's easy enough to swap the connector from the old mirror and just cut the unused wires on the mirror harness.Ballade makes some nice CF mirrors, may only be DE4 fitment though